Update substrate chain version (#473)

Author: David Ansermino

docker-compose-e2e.yml

@@ -16,7 +16,7 @@ services:
     - "8546:8545"
 
   sub-chain:
-    image: "chainsafe/chainbridge-substrate-chain:v0.0.1-alpha"
+    image: "chainsafe/chainbridge-substrate-chain:v1.0.0"
     container_name: sub-chain
     command: chainbridge-substrate-chain --dev --alice --ws-external --rpc-external
     ports: